Have you done anything to change the routing of your wiring from your equipment? I was recently on a multi-person Teams call for work, getting exasperated with a poor WiFi connection I unplugged the ethernet cable from my satellite receiver in one corner of my room and plugged it into my laptop in another. This necessitated moving a few intervening cables, including my phono stage power supply. Next time I switched my turntable on I got a nasty pulsed signal through the nearest speaker (not a ground loop hum) which I could only correct by physically moving the phono stage further away from the nearest speaker. I'd clearly done something to create interference by bringing power lead / speaker cable / interconnects (not sure what!) into contact with each other. Unlike me, you may well have a neat and tidy array of cables behind your equipment rack, in which case this advice isn't going to help - but if not, paying attention to separation of cables might cure the problem.